In 1996, a sheep called Dolly was born. She was the first mammal in history to be cloned from an adult. For this reason, Dolly had three mothers: the one who provided the egg, the one who carried her to term, and the one who provided the DNA. It was a remarkable leap from science fiction to science fact.  There's a tendency to think of Dolly as a duplicate, a carbon copy, of the sheep whose DNA was injected into the egg; as though Dolly … [Read more...]